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http://rima.ufrrj.br/jspui/handle/20.500.14407/26622Registro completo de metadados
| Campo DC | Valor | Idioma |
|---|---|---|
| dc.contributor.author | Lima, Pamella Pryscila de Alvarenga Bissoli Maciel de | - |
| dc.date.accessioned | 2026-10-13T14:42:03Z | - |
| dc.date.available | 2026-10-13T14:42:03Z | - |
| dc.date.issued | 2026-02-27 | - |
| dc.identifier.citation | LIMA, Pamella Pryscila de Alvarenga Bissoli Maciel de. Análise da resposta inflamatória e do microbioma cecal de frangos de corte desafiados com diferentes doses vacinais contra Eimeria spp. 2026. 93 f. Tese (Doutorado em Ciências Veterinárias) - Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2026. | pt_BR |
| dc.identifier.uri | http://rima.ufrrj.br/jspui/handle/20.500.14407/26622 | - |
| dc.description.abstract | A coccidiose aviária é uma doença entérica causada por Eimeria spp., responsável por comprometer a integridade do epitélio intestinal, reduzir a absorção de nutrientes e prejudicar o desempenho zootécnico das aves. Entre as espécies de maior importância para a avicultura destacam-se Eimeria tenella, E. acervulina e E. maxima. Neste estudo, frangos de corte Cobb 500 foram desafiados por gavagem oral, no primeiro dia de vida, com a vacina Fortegra® (MSD Saúde Animal), contendo oocistos atenuados dessas três espécies, em doses correspondentes a 10x, 20x e 40x a dose recomendada pelo fabricante, além de um grupo controle tratado com PBS. Amostras de tecidos intestinais e conteúdo cecal foram coletadas aos 7, 14 e 21 dias pós- desafio. A presença de Eimeria spp. nos tecidos intestinais foi avaliada por qPCR, e a expressão de genes relacionados à resposta imune e à integridade intestinal, bem como a composição da microbiota cecal, foram analisadas por abordagens moleculares. Os resultados demonstraram que tanto a dose do desafio quanto o tempo pós-infecção influenciaram a resposta imune, a integridade intestinal e a microbiota cecal dos frangos. No experimento de expressão gênica, utilizando os grupos 10x e 40x, a maior carga parasitária induziu respostas imunes mais intensas e prolongadas, caracterizadas pela modulação de citocinas pró- e anti-inflamatórias e pela regulação de genes relacionados às junções de adesão do epitélio intestinal. Observou-se um padrão temporal com picos iniciais de mediadores pró-inflamatórios, seguidos pela ativação de mecanismos moduladores, sugerindo tentativa do hospedeiro de conter a inflamação e restabelecer a homeostase intestinal. Entretanto, a maior carga parasitária também indicou possível supressão progressiva da resposta imune, o que pode comprometer a eliminação do patógeno e prolongar o reparo tecidual. Em paralelo, no experimento de microbiota, com os grupos 10x e 20x, a comunidade cecal foi modulada principalmente pelo tempo pós-infecção, com aumento progressivo da riqueza, equitabilidade e diversidade até 21 dias, refletindo o processo de maturação intestinal. O efeito da dose sobre o microbioma foi mais limitado, sendo a menor dose associada a maior equilíbrio microbiano e menor presença de táxons oportunistas, enquanto a dose mais elevada esteve relacionada à redução de gêneros potencialmente benéficos e ao aumento de táxons potencialmente patogênicos. De forma geral, os achados demonstram que a interação entre dose infecciosa e tempo pós-infecção é determinante para a compreensão dos mecanismos imunológicos e das alterações microbianas associadas à coccidiose em frangos, contribuindo para o aprimoramento de estratégias de controle, manejo e prevenção da doença na avicultura. | pt_BR |
| dc.description.sponsorship | Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES | pt_BR |
| dc.language | por | pt_BR |
| dc.publisher | Universidade Federal Rural do Rio de Janeiro | pt_BR |
| dc.subject | Gallus gallus | pt_BR |
| dc.subject | Eimeria tenella | pt_BR |
| dc.subject | Eimeria acervulina | pt_BR |
| dc.subject | Eimeria máxima | pt_BR |
| dc.subject | Expressão gênica | pt_BR |
| dc.subject | NGS | pt_BR |
| dc.subject | 16S rRNA | pt_BR |
| dc.title | Análise da resposta inflamatória e do microbioma cecal de frangos de corte desafiados com diferentes doses vacinais contra Eimeria spp. | pt_BR |
| dc.title.alternative | Analysis of the inflammatory response and cecal microbiome of broiler chickens challenged with different vaccine doses against Eimeria spp. | en |
| dc.type | Tese | pt_BR |
| dc.description.abstractOther | Avian coccidiosis is an enteric disease caused by Eimeria spp. that impairs the integrity of the intestinal epithelium, reduces nutrient absorption, and compromises the zootechnical performance of birds. Among the species of greatest importance to poultry production are Eimeria tenella, E. acervulina, and E. maxima. In this study, Cobb 500 broiler chickens were orally challenged on the first day of life with Fortegra® vaccine (MSD Animal Health), containing attenuated oocysts of these three species, at doses corresponding to 10×, 20×, and Intestinal tissue and cecal content samples were collected at 7, 14, and 21 days post-challenge. The presence of Eimeria spp. in intestinal tissues was evaluated by qPCR, and the expression of genes related to immune response and intestinal integrity, as well as the composition of the cecal microbiota, were analyzed using molecular approaches. The results showed that both challenge dose and post-infection time influenced the immune response, intestinal integrity, and cecal microbiota of broilers. In the gene expression experiment, using the 10× and 40× groups, the higher parasite load induced more intense and prolonged immune responses, characterized by modulation of pro- and anti-inflammatory cytokines and regulation of genes related to adhesion junctions in the intestinal epithelium. A temporal pattern was observed, with early peaks of pro-inflammatory mediators followed by the activation of modulatory mechanisms, suggesting an attempt by the host to contain inflammation and restore intestinal homeostasis. However, the higher parasite load also indicated a possible progressive suppression of the immune response, which may compromise pathogen clearance and prolong tissue repair. In parallel, in the microbiota experiment, using the 10× and 20× groups, the cecal community was modulated mainly by post-infection time, with a progressive increase in richness, evenness, and diversity up to 21 days, reflecting the process of intestinal maturation. The effect of dose on the microbiome was more limited, with the lower dose being associated with greater microbial balance and lower representation of opportunistic taxa, whereas the higher dose was associated with a reduction in potentially beneficial genera and an increase in potentially pathogenic taxa. Overall, these findings demonstrate that the interaction between infectious dose and post- infection time is critical for understanding the immunological mechanisms and microbial alterations associated with coccidiosis in broiler chickens, contributing to the improvement of control, management, and prevention strategies in poultry production. | en |
| dc.contributor.advisor1 | Santos, Huarrisson Azevedo | - |
| dc.contributor.advisor1ID | https://orcid.org/0000-0002-8218-3626 | pt_BR |
| dc.contributor.advisor1Lattes | http://lattes.cnpq.br/3751609492049306 | pt_BR |
| dc.contributor.advisor-co1 | Sousa, Felipe Dilelis de Resende | - |
| dc.contributor.advisor-co1ID | https://orcid.org/0000-0002-9681-4775 | pt_BR |
| dc.contributor.advisor-co1Lattes | http://lattes.cnpq.br/6013160057224364 | pt_BR |
| dc.contributor.advisor-co2 | Machado, Leandro dos Santos | - |
| dc.contributor.advisor-co2ID | https://orcid.org/0000-0003-4117-195X | pt_BR |
| dc.contributor.advisor-co2Lattes | http://lattes.cnpq.br/5006335731194193 | pt_BR |
| dc.contributor.referee1 | Fraga, Alícia Zem | - |
| dc.contributor.referee1ID | https://orcid.org/0000-0002-3056-7441 | pt_BR |
| dc.contributor.referee1Lattes | http://lattes.cnpq.br/7608490441428986 | pt_BR |
| dc.contributor.referee2 | Santos, Huarrisson Azevedo | - |
| dc.contributor.referee2ID | https://orcid.org/0000-0002-8218-3626 | pt_BR |
| dc.contributor.referee2Lattes | http://lattes.cnpq.br/3751609492049306 | pt_BR |
| dc.contributor.referee3 | Reis, Túlio Leite | - |
| dc.contributor.referee3ID | https://orcid.org/0000-0003-2141-8740 | pt_BR |
| dc.contributor.referee3Lattes | http://lattes.cnpq.br/7704527411657695 | pt_BR |
| dc.contributor.referee4 | Abreu, Dayse Lima da Costa | - |
| dc.contributor.referee4ID | https://orcid.org/0000-0002-9705-1909 | pt_BR |
| dc.contributor.referee4Lattes | http://lattes.cnpq.br/0725387860906270 | pt_BR |
| dc.contributor.referee5 | Martins, Nelson Rodrigo da Silva | - |
| dc.contributor.referee5ID | https://orcid.org/0000-0001-8925-2228 | pt_BR |
| dc.contributor.referee5Lattes | http://lattes.cnpq.br/3767979348338740 | pt_BR |
| dc.creator.ID | https://orcid.org/0000-0003-1881-9551 | pt_BR |
| dc.creator.Lattes | http://lattes.cnpq.br/7288934220988761 | pt_BR |
| dc.publisher.country | Brasil | pt_BR |
| dc.publisher.department | Instituto de Veterinária | pt_BR |
| dc.publisher.initials | UFRRJ | pt_BR |
| dc.publisher.program | Programa de Pós-Graduação em Ciências Veterinárias | pt_BR |
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IL-1 induced chemokine production through the association of Syk with TNF receptor-associated factor-6 in nasal fibroblast lines. Journal of Immunology, v. 167, n. 1, p. 283-288, 2001. YU, H. et al. Research Note: Correlation analysis of interleukin-6, interleukin-8, and CC motif chemokine ligand 2 gene expression in chicken spleen and cecal tissues after Eimeria tenella infection in vivo. Poultry Science, v. 99, n. 3, p. 1326-1331, 2020. YUN, C. H.; LILLEHOJ, H. S.; LILLEHOJ, E. P. Intestinal immune responses to coccidiosis. Developmental & Comparative Immunology, v. 24, n. 2-3, p. 303-324, 2000. ZAHEER, T. et al. Vaccines against chicken coccidiosis with particular reference to previous decade: progress, challenges, and opportunities. Parasitology Research, v. 121, p. 2749-2763, 2022. doi: 10.1007/s00436-022-07612-6. | pt_BR |
| dc.subject.cnpq | Medicina Veterinária | pt_BR |
| Aparece nas coleções: | Doutorado em Ciências Veterinárias | |
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